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masonorourke
02.08.2019 •
Physics
Asquare loop (length along one side = 20 cm) rotates in a constant magnetic field which has a magnitude of 2.0 t. at an instant when the angle between the field and the normal to the plane of the loop is equal to 20° and increasing at the rate of 10°/s, what is the magnitude of the induced emf in the loop?
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Ответ:
0.0048 V
Explanation:
The side of the coil is
L = 20 cm = 0.20 m
So the area is
The magnetic flux through the coil at any instant t is
where
B = 2.0 T is the magnetic flux density
A is the area of the coil
t is the time
We know that the coil rotates at an angular speed of 10°/s, which converted into radians is
The magnitude of the induced emf in the loop is equal to the derivative of the magnetic flux, so:
We want to know the magnitude of the emf when the angle is
, so substituting this value of the angle into
in eq.(1), we find:
Ответ:
why?
Explanation: